CVE-2026-44309

{
  "id": "CVE-2026-44309",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-15T17:16:47.297",
  "lastModified": "2026-10-26T14:10:00.130",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. Prior to 0.16.0, gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking the signature, instead of verifying against the raw git object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees: git-core uses the first, go-git uses the second. A signature crafted over the go-git-normalized form (second tree) passes gitsign verify while git-core resolves the commit to a completely different tree. This breaks the invariant that a verified signature, the commit semantics git-core presents to users, and the object hash logged in Rekor all refer to the same content. This vulnerability is fixed in 0.16.0."
    },
    {
      "lang": "es",
      "value": "Gitsign es una herramienta de firma Sigstore sin clave para commits de Git con tu identidad de GitHub / OIDC. Antes de la versión 0.16.0, gitsign verify y gitsign verify-tag recodificaban objetos de commit/etiqueta a través de EncodeWithoutSignature de go-git antes de verificar la firma, en lugar de verificar contra los bytes brutos del objeto git. Para objetos malformados con encabezados de árbol duplicados, git-core y go-git analizan árboles diferentes: git-core usa el primero, go-git usa el segundo. Una firma creada sobre la forma normalizada por go-git (segundo árbol) pasa gitsign verify mientras que git-core resuelve el commit a un árbol completamente diferente. Esto rompe el invariante de que una firma verificada, la semántica del commit que git-core presenta a los usuarios y el hash del objeto registrado en Rekor se refieren todos al mismo contenido. Esta vulnerabilidad está corregida en la versión 0.16.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "sigstore",
          "product": "gitsign",
          "versions": [
            {
              "version": "< 0.16.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-15T17:43:27.049597Z",
          "id": "CVE-2026-44309",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        },
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/sigstore/gitsign/security/advisories/GHSA-7rmh-48mx-2vwc",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/sigstore/gitsign/security/advisories/GHSA-7rmh-48mx-2vwc",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}